14-01-2014, 03:47 PM
A MINI PROJECT REPORT ON PORTABLE U.S.B MOBILE CHARGER
INTRODUCTION
Cell phone charging is a problem when we are away from home or where main source is not available. A fully charged phone may last its battery up to 3 to 8 hours depending how it is used. When you are out for picnics, camping, and or having adventure with your cell phone battery empty, you cannot receive calls, take pictures or listen to music, or we might have forgotten to charge our mobile, thus a simple and portable mobile charger is a need.
A good charger has an output of 4V DC to 8V DC and a current capacity of 100mA up to 500mA.With this charger capacity, standard 3.7V at 850mA battery can be charged up to 2 hours to 4 hours. Now we have come up with a solution new portable mobile charger which we can carry easily and charge our mobile in emergency conditions or whenever mobile is running out of charge.
WORKING
Portable mobile charger consists of battery source usually of 9V and above followed by a regulator circuit of 5V at the input to the circuit it consists of a Capacitive filter to avoid any repels from the battery. Pin1 is input where 9V is applied and pin2 is common for both input and output and pin3 is output pin which gives an constant output voltage of 5volts. An LED indicator is provided for indication of output. The circuit diagram is shown in figure.
This charger is provided with a U.S.B port which is suitable for any mobile which makes comfortable and ease of usage.